This is a small fix doing two things:

First, shifting over to the butler updating system so that updates can be made more rapidly in the future if necessary.

Second, moving some lines of code so that the 'Completed the Ending Gallery' checklist item triggers correctly the first time you complete the gallery. (As it was, it was checking "are all endings complete?" before unlocking whatever ending you just reached, so you'd have to end the game again to get the checklist to trigger correctly. Minor annoyance, but annoying.) 

Let me know if you encounter any problems!